Leases - Supplemental balance sheet information (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Leases
Operating lease right-of-use assets	$ 48,684
Operating lease asset location on balance sheet	us-gaap:OperatingLeaseRightOfUseAsset
Operating lease liabilities, current	$ 11,543
Operating lease liabilities current location on balance sheet	us-gaap:OperatingLeaseLiabilityCurrent
Operating lease liabilities, noncurrent	$ 41,697
Operating lease liabilities non current location on balance sheet	us-gaap:OperatingLeaseLiabilityNoncurrent
Total lease liabilities	$ 53,240